Silicone Molding with 3D Printed Molds

Silicone molding is a powerful production method that when combined with 3D printing, can allow you to make several of one product, or create a product in a material that is not supported by your 3D printer.

In this How To, we will show you some of the best practices associated with 3D printing molds to pour into. To demonstrate this process, we will create a bicycle handlebar grip out of flexible silicone using a 3D printed mold.

Working time will vary depending on a number of factors. This process took us about 30 minutes excluding cure times, which will vary depending on the silicone products used.


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Print Mold

As silicone molding is not very demanding on your prints, there are minimal print settings to take into account when printing a mold.

In this case we used standard settings. If surface finish of the cast part is of concern, consider sanding your printed mold.

Print Mold

Prepare Mold

Spray all mold surfaces with mold release & fasten mold pieces together with rubber bands

Prepare Mold

Open and Stir Silicone

You will need to stir each part of the silicone individually before mixing.


Be sure not to stir too vigorously, otherwise you will stir in air bubbles which can be detrimental to your cast part.

Combine parts A and B and stir.

Mix Parts A and B


Stir slowly as not to mix in air bubbles.


Check instructions for the “pot-life” of your silicone. This will tell you how long you have to work with your silicone until it cures.

What’s Next

Visit one of our other applications pages for tips on how to take your print even further.

We recommend that you visit our pages on:

Silicone Molding Part I
Vacuum Forming

Last but not least, remember to share your work with us on Thingiverse and social media @MakerBot.

We can’t wait to see what you make!


Bike Handle Bar Grip Mold

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